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2004 Fiscal Year Final Research Report Summary

Application of canopy photosythesis models to the analysis of leaf phenology

Research Project

Project/Area Number 14340241
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 生態
Research InstitutionTohoku University

Principal Investigator

HIROSE Tadaki  Tohoku University, Graduate School of Life Sciences, Professor, 大学院・生命科学研究科, 教授 (90092311)

Co-Investigator(Kenkyū-buntansha) HIKOSAKA Kouki  Tohoku University, Graduate School of Life Sciences, Associate Professor, 大学院・生命科学研究科, 助教授 (10272006)
Project Period (FY) 2002 – 2004
KeywordsLeaf phenology / Canopy photosynthesis models / Lifespan / Stratification / Nitrogen use efficiency / Forest / Nitrogen productivity / Mean residence time
Research Abstract

The lifespan of leaves is shorter than that of individuals, and plants produce and shed their leaves in the growth period. The pattern of leaf production and shedding is different among species as is represented in evergreen and deciduous species. We considered difference in leaf phenology as a strategy of plants to adapt themselves to changing environments. Applying a canopy photosynthesis model to the analysis of leaf phenology, we developed a new model of leaf dynamics and nitrogen. The model predicted optimal LAI, canopy photosynthesis, leaf lifespan, nitrogen use efficiency, and also their responses to changes in nitrogen and light availability. In experimentally established herbaceous stands, we analysed the factors responsible for leaf production and shedding. Leaf area loss rate increased in shaded leaves with an increase in N retranslocation to meet the N demand for growth of the plant. We demonstrated that leaves were discarded Oven though maintaining those leaves longer would contribute to plant growth at low N availability, while at high N availability leaves were not discarded even though retranslocation of N associated with leaf loss would increase total plant growth rate. In a beech forest, we found that canopy and understorey tree species had a similar N resorption rate that did not depend on the light availability. In the same forest, we found that leaf level N use efficiency was not significantly different between canopy and understorey species, though the mechanism was very different from each other. Canopy species had a high N productivity with a low mean residence time of N, while understorey species had a high residence time of N with a low N productivity. We studied responses of leaf photosynthesis to environmental changes. Availability of vacant space in mesophyll cell surfaces to accomodate enlarged chloroplasts is indispensable to positively respond to sudden increase in light climate.

  • Research Products

    (9 results)

All 2005 2004

All Journal Article (7 results) Book (2 results)

  • [Journal Article] Leaf canopy as a dynamic system : ecophysiology and optimality in leaf turnover.2005

    • Author(s)
      Hikosaka K
    • Journal Title

      Annals of Botany 95

      Pages: 521-533

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Interspecific difference in the photosynthesis-nitrogen relation-ship : patterns, physiological causes, and ecological importance.2004

    • Author(s)
      Hikosaka K
    • Journal Title

      Journal of Plant Research 117

      Pages: 481-494

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Photosynthetic rates and partitioning of absorbed light energy in photoinhibited leaves.2004

    • Author(s)
      Hikosaka K, Kato MC, Hirose T
    • Journal Title

      Physiologia Plantarum 121

      Pages: 699-708

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Cost-benefit relationships in fronds emerging at different times in a deciduous fern Pteridium aquilinum.2004

    • Author(s)
      Oikawa S, Hikosaka K, Hirose Tほか
    • Journal Title

      Canadian Journal of Botany 84

      Pages: 521-527

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Allocation of nitrogen to cell walls decreases photosynthetic nitrogen use efficiency.2004

    • Author(s)
      Onoda Y, Hikosaka K, Hirose T
    • Journal Title

      Functional Ecology 18

      Pages: 419-425

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Photosynthesis or persistence : nitrogen allocation in leaves of evergreen and deciduous Quercus species.2004

    • Author(s)
      Takashima T, Hikosaka K, Hirose T
    • Journal Title

      Plant, Cell and Environment 27

      Pages: 1047-1054

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Cost-benefit relationships in fronds emerging at different times in a deciduous fern Pteridium aquilinum.2004

    • Author(s)
      Oikawa S, Hikosaka K, Hirose T et al.
    • Journal Title

      Canadian Journal of Botany 84

      Pages: 521-527

    • Description
      「研究成果報告書概要(欧文)」より
  • [Book] 植物生態学2004

    • Author(s)
      寺島一郎, 彦坂幸毅ほか
    • Total Pages
      431
    • Publisher
      朝倉書店
    • Description
      「研究成果報告書概要(和文)」より
  • [Book] Syokubutsuseitaigaku2004

    • Author(s)
      I.Terashima, K.Hikosaka, et al.
    • Total Pages
      431
    • Publisher
      asakurasyoten
    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2006-07-11  

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